Constraints on $τ$ electromagnetic moments via tau pair production at the Muon colliders

Abstract

The anomalous magnetic ($\tilde{a}_τ$) and electric dipole ($\tilde{d}_τ$) moment of tau lepton described in $τ\barτγ$ vertices are studied via $μ^{+}μ^{-} \rightarrow τ^+\barτ^-$ process at the Muon colliders designed with the proposed center-of-mass-energy / integrated luminosity configurations of 3 TeV/ 1 ab$^{-1}$ and 10 TeV/ 10 ab$^{-1}$.We obtained the $95\%$ confidence level limits on the $\tilde{a}_τ$ and $\tilde{d}_τ$ parameters without and with systematic uncertainty of $10\%$ and compared with the experimental results.The most stringent limits on the anomalous couplings without systematic uncertainty are $-2.63\times10^{-4}< \tilde{a}_τ<2. 65\times10^{-4}$ and $\mid \tilde{d}_τ\mid \leq 1.47\times10^{-18} e cm$ at $\sqrt s =10$ TeV and $L_{int}$=10 ab$^{-1}$ option of the Muon collider. Our results show that the Muon colliders lead to a remarkable improvement on the current experimental limits of the anomalous magnetic and electric dipole moments of the tau lepton.